谁可以帮我找找语法啊..Postal systems in Egypt dated from about 2000 B.

谁可以帮我找找语法啊..
Postal systems in Egypt dated from about 2000 B.C The Persian Empire (6th century B.C) used a system of mounted relay messengers.The riders would stop at regularly placed posthouses to get a fresh horse or to pass on their packets of dispatches to another messenger for the remainder of the distance
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